The width of fringe is 2 mm on the screen in a double slits experiment for the light of wavelength of 400 nm. The width of the fringe for the light of wavelength 600 nm will be: (a) 4 mm (b) 1.33 mm (c) 2 mm (d) 3 mm

Answer: (d). β ∝ λ: β' = 2×(600)/(400) β' = 3 mm, so the answer is (d).

The width of fringe is 2 mm on the screen in a double slits… | JEE Main 2023 (8 Apr, Shift 2)

Q31JEE Main 2023 · 8 APR · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

The width of fringe is $2\text{ mm}$ on the screen in a double slits experiment for the light of wavelength of $400\text{ nm}$ . The width of the fringe for the light of wavelength 600 $\text{nm}$ will be:

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Answer: (d)

$\beta \propto \lambda$ : $\beta' = 2\times\frac{600}{400}$
$\beta' = 3$ mm, so the answer is (d).

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